Device for monitoring open terrain and for protecting objects
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United States of America Patent
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Nov 17, 1998
Issued Date -
N/A
app pub date -
Aug 8, 1997
filing date -
Oct 10, 1995
priority date (Note) -
Expired
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Abstract
A monitoring device for detecting acoustic vibrations in monitored objects has a plurality of several structure-borne sound sensors which are connected to a remote central electronic analyzing system. The individual structure-borne sound sensors are each acoustically coupled with a self-testing unit, which can be activated from the central electronic analyzing system. Activation of the self-testing units is performed by modulation of an operating voltage supplied to structure-borne sound sensors, without additional electric connections to the electronic analysis system.
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